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In an exoplanet atmosphere far, far away

JWST collects vast amounts of information about exoplanets light years away from Earth. Back home, the measured optical constants of laboratory aerosols are critically input parameters in models to interpret the observational results.

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Fig. 1: Optical constants of exoplanet haze analogues and their impact in simulated transit spectra.


  1. He, C. et al. Optical properties of organic haze analogues in water-rich exoplanet atmospheres observable with JWST. Nat. Astron. (2023).

    Article  Google Scholar 

  2. Gao, P., Wakeford, H. R., Moran, S. E. & Parmentier, V. Aerosols in exoplanet atmospheres. JGR Planets 126, e2020JE006655 (2021).

    Article  CAS  ADS  Google Scholar 

  3. Gao, P. et al. Aerosol composition of hot giant exoplanets dominated by silicates and hydrocarbon hazes. Nat. Astron. 4, 951–956 (2020).

    Article  ADS  Google Scholar 

  4. Grant, D. et al. JWST-TST DREAMS: Quartz clouds in the atmosphere of WASP-17b. Astrophys. J. Lett. 956, L32 (2023).

    Article  ADS  Google Scholar 

  5. Gao, P. et al. The hazy and metal-rich atmosphere of GJ 1214 b constrained by near- and mid-infrared transmission spectroscopy. Astrophys. J. 951, 96 (2023).

    Article  ADS  Google Scholar 

  6. Khare, B. N. et al. Optical constants of organic tholins produced in a simulated Titanian atmosphere: From soft X-ray to microwave frequencies. Icarus 60, 127–137 (1984).

    Article  CAS  ADS  Google Scholar 

  7. Sciamma-O’Brien, E., Roush, T. L., Rannou, P., Dubois, D. & Salama, F. First optical constants of laboratory-generated organic refractory materials (tholins) produced in the NASA Ames COSmIC facility from the visible to the near infrared (0.4–1.6 μm): Application to Titan’s aerosols. Plant. Sci. J. 4, 121 (2023).

    Google Scholar 

  8. Gavilan, L., Carrasco, N., Hoffmann, S. V., Jones, N. C. & Mason, N. J. Organic aerosols in anoxic and oxic atmospheres of Earth-like exoplanets: VUV-MIR spectroscopy of CHON tholins. Astrophys. J. 861, 110 (2018).

    Article  ADS  Google Scholar 

  9. Drant, T. et al. Optical constants of exoplanet haze analogs from 0.3 to 30 μm: Comparative sensitivity between spectrophotometry and ellipsometry. Astron. Astrophys. 682, A6 (2024).

    Article  Google Scholar 

  10. Corrales, L., Gavilan, L., Teal, D. J. & Kempton, E. M.-R. Photochemical hazes can trace the C/O ratio in exoplanet atmospheres. Astrophys. J. Lett. 943, L26 (2023).

    Article  ADS  Google Scholar 

  11. He, C. et al. Haze formation in warm H2-rich exoplanet atmospheres. Planet. Sci. J. 1, 51 (2020).

    Article  Google Scholar 

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The authors thank N. Batalha (NASA Ames Research Center) and P. Gao (Carnegie Institution for Science, Washington DC, USA) for providing the data for the figure.

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Correspondence to Ella Sciamma-O’Brien.

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Optical Constants database (OCdb):

PAH IR spectra database (PAHdb):

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Sciamma-O’Brien, E., Drant, T. & Wogan, N. In an exoplanet atmosphere far, far away. Nat Rev Chem 8, 157–158 (2024).

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